CN102312429B

CN102312429B - Rapid separation and integral hoisting method for pile head of cast-in-place concrete pile

Info

Publication number: CN102312429B
Application number: CN 201110193373
Authority: CN
Inventors: 刘卫东; 杨文辉; 刘鑫; 张化锋; 高永辉
Original assignee: No 2 Engineering Co Ltd of CCCC First Harbor Engineering Co Ltd; Northwest Research Institute Co Ltd of CREC
Current assignee: Gansu Tieke Construction Engineering Consulting Co., Ltd.
Priority date: 2011-07-12
Filing date: 2011-07-12
Publication date: 2013-08-07
Anticipated expiration: 2031-07-12
Also published as: CN102312429A

Abstract

The invention discloses a rapid separation and integral hoisting method for the pile head of a cast-in-place concrete pile. Before a steel reinforcement cage is lowered down, a sleeve is firstly installed at the top end of the steel reinforcement cage on a main reinforcement with a pile head section which is required to be chiseled off; the two ends of the sleeve are plugged to prevent cement from entering the sleeve; after the strength of concrete in a pile body reaches the design requirement and the pile head is excavated, a slip is cut at the bottom end of the pile head section to be chiseled off along the annular direction of the pile head, and an annular groove is chiseled upwards to expose the sleeve; at least three bores are drilled on the annular side wall of the lower part of the pile head section to be chiseled off, reinforcement short sections are inserted into the drilled bores, and the exposed parts of the reinforcement short sections are used for tying a steel wire rope for hoisting; and hoisting can be conducted after the steel wire rope is well tied, so that the pile head section required to be chiseled off which is separated from the main reinforcement of the pile head is integrally hoisted. Since the concrete of the pile head section to be chiseled off and the main reinforcement are not bonded with each other, when the pile head is chiseled off, the operation for stripping the main reinforcement of the pile head off from the concrete is not required, the pile head chiseling speed is greatly accelerated, and the construction cost is reduced.

Description

Concrete filling pile head separates and integral hoisting method fast

Technical field

The invention belongs to the Concrete Grouting Pale technical field, be specifically related to concrete filling pile head by the super processing method of filling with part of standard.

Background technology

Due to the Concrete Grouting Pale technology maturation, ground adaptability is strong, and supporting capacity is good, is widely used in all kinds of Foundation Designs.In the construction of cast-in-place concrete pile, for guaranteeing the concrete quality of pile crown, therefore filling pile head absolute altitude 0.5～1.0m(that the constructor all will exceed setting by code requirement when concrete perfusion is section doping laitance, mud), and then cut this part exceeded (being referred to as the broken pile head).

Exceed for cutting the concrete of setting the grout pile head part, still adopt the method that artificial chisel removes or the human assistance small-sized machine is abolished at present always.Due to the powerful bond stress of concrete to pile crown master muscle, therefore to peel off one by one the main muscle bonded by concrete and reject unnecessary concrete, expend a large amount of manpower and materials, labour intensity is large, speed of application is slow, particularly the quality of pile body and the main muscle of pile body are damaged greatly, do not conformed to the desired high efficiency of the infrastructure projects of current a large amount of development, high-quality.

Summary of the invention

The object of the invention is to overcome above-mentioned the deficiencies in the prior art, provide a kind of high efficiency and high-quality requirement that can guarantee in infrastructure projects Concrete Grouting Pale, and simple and easy to do concrete filling pile head separates and integral hoisting method fast.

For achieving the above object, the technical scheme that the present invention takes is:

A kind of concrete filling pile head separates and integral hoisting method fast, comprises the following steps:

(i) before descending reinforcing cage, first on the reinforcing cage top, need cut on the main muscle of pile crown section the sleeve pipe that internal diameter is greater than main muscle external diameter is installed;

(ii) shutoff sleeve pipe two ends, while preventing concrete perfusion, cement paste enters sleeve pipe;

(iii) technology descending reinforcing cage, concrete perfusion routinely, after the pile body concrete strength reaches designing requirement and excavates out the pile crown section, need to cut the bottom of pile crown section in design of pile top absolute altitude position, cut along the pile crown hoop joint-cutting that 2～2.5cm is dark, then up dig out along joint-cutting the hoop groove that width is 9～11 cm, to expose sleeve pipe;

(iv) on cutting the bottom hoop sidewall of pile crown, need get out at least three eyes, jewel hole is vertical with the pile body longitudinal axis, cross section equidistantly distributes, and hole depth only need reach 1/5 of a footpath, then the reinforcing bar pipe nipple is inserted in jewel hole, the reinforcing bar pipe nipple will expose one section, in order to the wire rope that is lifting use;

(v) after fastening wire rope, can lift by crane, the concrete that will exceed the pile crown part of design of pile top absolute altitude separates with pile crown master muscle, and the pile crown part integral body that the need after separating are cut hangs out.

Described step (ii) in, during shutoff sleeve pipe two ends, first use the gap between plastics blowing agent shutoff termination master's muscle and internal surface of sleeve pipe, then be wound around tight with adhesive tape.

Described step (v) in, as larger as lifting force, first throw several chocks in the hoop groove cut, the pile crown wedge that need are hung out is disconnected separate after, the concrete part integral body of separation is hung out.

Above-mentioned concrete filling pile head provided by the invention separates and integral hoisting method fast, due to before descending reinforcing cage, sleeve pipe has been installed on the main muscle of the pile crown section top that first need cut at reinforcing cage, pile crown concrete and main muscle are not bonded, after excavation of foundation pit, while cutting pile crown, do not need to carry out pile crown master muscle and concrete overburden operation, cut speed thereby greatly accelerate pile crown, and be convenient to discarded blocking of pile crown section and hang out, reduce construction cost.Compared with prior art, the beneficial effect main manifestations had is in the present invention:

A. convenient and swift: easy to operate, corollary equipment is few, and the constructor is acceptant, and expertly operation very soon;

B. economical: construction equipment and personnel greatly reduce, and speed is accelerated, according to measuring and calculating, this method and original artificial chisel except or the human assistance small-sized machine cut the method comparison, but every pile cost saving is saved time more than one day more than 150 yuan;

C. quality assurance: pile crown master muscle top is equipped with sleeve pipe, while abolishing pile crown, can be easy to make the pile crown concrete to separate with pile crown master muscle, makes pile foundation master muscle injury-free, guarantees pile foundation master muscle and pile body concrete quality;

D. safe and reliable: in pile crown lifting process, all constructors, away from operation site, have eliminated and have hung out the potential safety hazard that the pendant thing damages the constructor, safe and reliable.

The accompanying drawing explanation

Fig. 1 is that the plastic bushing schematic diagram is installed on reinforcing cage master muscle top;

Fig. 2 is for need cut pile crown section bottom part ring to the groove schematic diagram;

Fig. 3 inserts reinforcing bar pipe nipple schematic diagram for cut pile crown pars infrasegmentalis jewel hole at need;

Fig. 4 needs to cut pile crown section cross section distribution reinforcement pipe nipple schematic diagram in Fig. 3;

Fig. 5 is for need cut pile crown section integral hoisting schematic diagram.

In figure: 1-sleeve pipe termination, the 2-sleeve pipe, 3-design of pile top absolute altitude position, 4-reinforcing cage master muscle, 5-need cut the pile crown section, 6-hoop groove, 7-pile body, 8-jewel hole, 9-wire rope.

The specific embodiment

Below in conjunction with the specific embodiment and accompanying drawing thereof, the invention will be further described:

As shown in Figure 1, before descending reinforcing cage, the elbow of reinforcing cage master muscle 4 does not first apply and (in some filling pile construction design, for the be connected effect of reinforcement cast-in-place concrete pile with cushion cap, the termination of reinforcing cage master muscle 4 is made to 90 ^.elbow), certain-length, wall thickness and hardness first are installed on reinforcing cage master muscle 4 tops (need cut the pile crown section), and internal diameter is greater than the plastic bushing 2(PVC sleeve pipe of reinforcing cage master muscle 4 external diameters), plastic bushing 2 internal diameters, pipe thickness and hardness will meet the demands, the length of plastic bushing 2 and insertion position are consistent with the former pile crown cut, and to, in the process of concrete perfusion, control plastic bushing 2 bottoms well in design of pile top absolute altitude position 3; Shutoff sleeve pipe termination 1, sleeve pipe termination 1 wants shutoff tight, first uses the gap between plastics blowing agent shutoff reinforcing cage master's muscle 4 terminations and plastic bushing 2 inwalls, then is wound around tightly with adhesive tape, and while preventing concrete perfusion, cement paste enters plastic bushing 2.

As shown in Figure 2; after pile body 7 concrete strengths reach designing requirement and excavate out the pile crown section; (degree of depth is less than thickness of concrete cover deeply to cut 2～2.5cm with toothless saw along the pile crown hoop at stake setting 3 places, absolute altitude position, top (needing to cut pile crown section 5 bottoms); and prevent from injuring pile crown master muscle); then machinery up digs out along joint-cutting the hoop groove 6 that width is 9～11 cm, to expose plastic bushing 2.

As shown in Figure 3, Figure 4, cut the eye that machinery on the bottom hoop sidewall of pile crown section 5 gets out four diameter 3cm at need, jewel hole 8 is vertical with the longitudinal axis of pile body 7, cross section is uniform, the degree of depth of jewel hole 8 only need reach 1/5 of a footpath, then the reinforcing bar pipe nipple of four (φ 2.5cm) is inserted in jewel hole 8, this reinforcing bar pipe nipple will expose one section, in order to the wire rope 9 that is lifting.

As shown in Figure 5, can lift by crane after fastening wire rope 9, because concrete tensile strength is very low, needed pull-off force is very little, so easily integral body hangs out.As larger as lifting force, can first throw several chocks in groove 6 in the ring cut, need cut pile crown section 5 and be easy to be broken by wedge.

During the technology descending reinforcing cage, positioning bar appropriately adjusts, and not affect to hang, is advisable routinely.

Claims

1. a concrete filling pile head separates and integral hoisting method fast, it is characterized in that, the method comprises the following steps:

(i) before descending reinforcing cage, first on the reinforcing cage top, need cut on the main muscle of pile crown section the PVC plastic bushing that internal diameter is greater than main muscle external diameter is installed, the internal diameter of PVC plastic bushing, pipe thickness and hardness will meet the demands;

(ii) during shutoff PVC plastic bushing two ends, first use the gap between plastics blowing agent shutoff termination master's muscle and internal surface of sleeve pipe, then be wound around tightly with adhesive tape, while preventing concrete perfusion, cement paste enters the PVC plastic bushing;

(iii) technology descending reinforcing cage, concrete perfusion routinely, after the pile body concrete strength reaches designing requirement and excavates out the pile crown section, need the pile crown bottom cut in design of pile top absolute altitude position, cut along the pile crown hoop joint-cutting that 2～2.5cm is dark, then up dig out along joint-cutting the hoop groove that width is 9～11 cm, to expose the PVC plastic bushing;

(iv) on the pile crown bottom hoop sidewall cut at need, get out at least three eyes, jewel hole is vertical with the pile body longitudinal axis, cross section equidistantly distributes, and hole depth only need reach 1/5 of a footpath, then the reinforcing bar pipe nipple is inserted in jewel hole, the reinforcing bar pipe nipple will expose one section, in order to the wire rope that is lifting use;

(v) after fastening wire rope, can lift by crane, the concrete that will exceed the pile crown part of design of pile top absolute altitude separates with pile crown master muscle, and the pile crown section integral body that the need after separating are cut hangs out.

2. concrete filling pile head according to claim 1 separates fast and integral hoisting method, it is characterized in that, described step (v) in, as larger as lifting force, first throw several chocks in the hoop groove cut, after the disconnected separation of the pile crown wedge that need are cut, then integral body hangs out.